# Test Foundation

## Problem

The crate parser handles unusual binary text and known extension artifacts. Without
automated tests, a small refactor could silently change library counts or reports.

## Architecture

Tests cover the read-only pipeline from crate and filesystem inputs through the
core library model to CSV, text, and CLI output. All test data is synthetic and is
created in temporary directories.

## Edge Cases

- Known MP3, M4A, WAV, and AIF decode artifacts.
- Crate records without a recognized stop marker.
- Supported extensions with mixed case and unsupported files.
- References that exist by filename and references that remain missing.

## Verification

Run `pytest`. No test reads a real Serato library or writes outside pytest's
temporary directory.